Hodl on and make sure your wallets are backed up…
The G-Shock G-2900F-1V is an affordable model that rarely gets any attention but it is one of the most feature-rich G-Shock watches for the money. The G-2900F-1V has world time, 5 alarms with 1 snooze alarm, and a 10-year battery (the longest for a non-solar G-Shock). It is also the only current G-Shock with an e-Data Memory that allows you to store up to 315 characters. These characters include numbers, letters, and symbols, so a wide variety of data can be recorded. Assuming you haven’t panic sold all of your bitcoin and cryptocurrency yet, the G-2900 is the lone G-Shock watch that is capable of storing your 12 to 24-word BIP39 seed phrase recovery key for hardware wallets like the Ledger Nano and software wallets like Electrum.
Why use the G-Shock G-2900F-1V to store your Bitcoin recovery seed key?
Rugged: The G-Shock G-2900 is waterproof and shockproof, making it superior to paper and other electronic options.
Offline: The watch can’t be hacked through the internet and is immune to malware, keystroke loggers, and screen capture.
Inconspicuous: Though it does have a small “e-Data Memory” label on the bezel, it is not that noticeable, and G-Shock watches aren’t associated as data bank watches. This makes it a less obvious target.
Warning and Disclaimer: We don’t suggest using a G-Shock G-2900F-1V as your only backup as there are some significant drawbacks such as not being fireproof, having a finite lifespan, and being protected only by a 4-digit PIN. We recommend it more as a backup of a backup that is convenient to access and easy to carry. Keep in mind that it is only as secure as the 4-digit PIN you set. This password protection is optional, so make sure you set it up before recording any data. If the PIN is lost, the only way to regain access to the e-Data function is to reset the watch (by an authorized dealer) which will clear all the data. However, we cannot guarantee that the G-2900 is unhackable. Someone could try all 10,000 possible PIN combinations until they find the correct one. Anyone with access to your recovery key will have full access to your bitcoin (even if your current wallet is password protected), so use the G-2900 at your own risk. Other Casio Databank watches do not have the password protection of the G-2900 has and we do not recommend using other Casio models for this purpose.
We also suggest looking into more permanent backup options with stamped metal plate wallets.
Some tips on using a G-Shock G-2900F-1V to store your Bitcoin recovery key:
The G-2900F-1V can store up to 315 characters total (and each set is limited to 63 characters). If using 7 characters or less per set, it can hold 40 sets.
To save space for other data, you can just use the first four letters of each word, which is all you need for the BIP39 standard.
Another option is to convert each word to its numerical counterpart using the BIP39 word list. If the watch is compromised this may make it less obvious that the data is a recovery seed phrase.
For full instructions on using the e-Data Memory feature of the G-2900F-1V, please view the instructions.
Disclaimer: This post does not imply endorsement of Bitcoin by Casio G-Shock. Also this post is not financial advice.